Dynamo-electric machinery.



PATENTED AUG. 6, 1 907..

W. L. WATERS. DYNAMO ELECTRIG MACHINERY.

APPLICATION FILED D120. 9, 1905- llllnllllllllllllIllllllmmlnlnl her-15p\N'liham. LT. WE'IEF'E \YILLL-ui L. WATERS, on

MILWAUKEE. WISCONSIN, ASSIGNOR TO. NATIONAL BRAKE &

ELECTRIC COMPANY, 01- MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

DYNAMIC-ELECTRIC MACHINERY.

Specification of Letters Patent.

Patented Aug. 6, 1907.

To all whom it may conm'n:

Be it known that I, WILLIAM L. WATERS, a citizen of the United States,residing at Milwaukee, in the county of Milwaukee and State ofWisconsin, have in- .vented a certain new and useful Improvement inDynamo-Electric Machinery, of which the following is a full, clear,concise, and exact description, reference being had to the accompanyingdrawings, forming a part of this specification.

My invention relates to dynamo electric machinery, and particularly toalternating current machinery such as induction motors, and its objectis to provide improved arrangement of a short-circuited or so-calledsquirrel cage winding for. the armature thereof. A winding of this kindconsists of the bars which are usually disposed within the armltureslots and of short- .circuiting rings which connect together theprojecting ends of the bars. I In prior arrangements of these windingsthe short circuiting rings are secured to the bar ends by being rivetedthereto or secured by means 0 screws.

My invention contemplates a very much simplified means for connectingthe bar ends with the short-circuiting rings. In my construction eachshort circuiting ring is in two parts, an outer ring and an inner ring,the inner ring being sprung into place to engage the inner surface ofthe bar, and the outer ring is first heated then slipped over theoutside of the bar ends and allowed to cool to cause the bars to besecurely clamped between the rings upon shrinking of the outer rings.

My invention will be best understood by reference to theaccompanyingdrawing in which Figure 1 is an end view or an armature with thesquirrel cage winding in position. Fig. 2 is a sectional view taken'online 2-2 of Fig. 1, and Fig. 3 shows a modified arrangement ofshort-circuiting rings and bars. The armature which may be composed oflaminations ll has the teeth 2 and the slots 3, A windingor bar 4 liesin each slot and its ends 5-5 project beyond the ends of t'he armature.Each short-circ'uiting member consists of an inner ring G and an outerring 7 and may be of copper or any other conducting material. The 1method of securing the'coils in position is as follows: Aim-r the barsare properly disposed'within the slots the inner rings are sprung intoplace to engage the inner faces of the bar ends. The outer rings? arethen heated to be expanded sufficiently so that they may he slipped overthe bar ends and upon cooling of-these outer rings they will shrink andwill securely clamp the bar ends against the inner rings, thisarrangement being much simpler and less expensive than priorarrangements in which the sho'rt-circuiting rings were chanical fixingring for the other or conducting ring.

bars. each short-circuiting conductor consisting of an 'and the outerring being adapted to be shrunk about the riveted or screwed to the barends. Tofurthcr secure the rings in position a notch or groove 8 may beprovided in the inner face of each bar end for receiving the inner ring,and a notch or groove 9 may also be cut in the outer face of each barend for receiving the outer rings 7 and the rings will thus be securelyheld against longitudinal displacement. The grooves 8 and 9 may bedirectly opposite or may be displaced asdesired. It is also notnecessary that both rings be in electrical c ntactwith the bars and asshown in Fig. 3 one of the rings, for instance the inner supporting ring6, may

be insulated from the bars by interposing press-board 10 or otherinsulating material in the slots 8 between the inner ring and the bars.Both rings are preferably cast or welded to form a single piece andwhere one of them is insulated from the bars this insulating ring mightbe of iron or other strong material to act as a me- Otherarrangementswill also suggest themselves without departing from the spirit of theinvention, and I do not, therefore, wish to be limited to that hereinshown and described.

What I-claini as new and 'desire to secure by Letters Patent is:

1. In a squirrel cage armature, the combination with the conducting barsof the winding, of a short-circuiting conductor at each end forconnecting together the ends of the outer and an inner ring betweenwhich the bar ends are clamped, there being grooves in the bars forreceiving the rings.

2. In a squirrel cage armature. the combination with the conducting barsof the winding. of a short-circuiting conductor at each end of thearmature for electrically uniting the bar ends. each s'hort-circuitingconductor consisting of an inner and an outer ring. the inner ring beingadapted to be sprung to engage slots in the inner sides of the bar ends.

outside of the bar ends whereby the bar ends are securely clampedbetween the rings.

I. In a squirrel cage armature. the. combination with the conductingbars of the winding. of a short-circuiting con ductor at each end of thearmature for electrically uniting the barends. each short-circuitingconductor consisting of an inner and an outer ring. the inner ringbcingadaptcd to be sprung to engage thc inner sides of the bar ends, andthe outer ring being adapted to he shrunk about the outside of the barends whereby the bar ends are securely clamped between the rings, therebeing grooves in said bars for receiving said rings to prevent lateraldisplacement thereof. 4. Ina squirrel cage armature, the combinationwith the conducting bars of the winding. of a short-circuiting-conductor at each end of the armature for electrically uniting the barends, each short-circuiting conductor consisting of an outer ring. therebeing slots in the inner sides of said conducting bars adapted forholding insulating material, an inner supporting ring adapted to besprung to engage said insulating material and the outer ring beingadapted 5. In a squirrel cage armature, the combination with theconducting bars of the winding. of a short-circuiting cunductor at eachend oi thearmature for electrically uniting the bar ends, enchshort-circuiting conductor cum n-1 mg an ouier ring there being slots inthe inner sides of said conducting bars, insulating material adapted tobe placed in said slots, said material having slots, an innersuppoi'ting frame adapted to be sprung into said slots. and the outm'ring being adapted to W- shrunk nbnur the umside of he hair ends wherebythe hlu' ends zmse-cnl'Hy clamped.

in witness \vhui'eofl I hervunru suhwribe my name [his 1st duypf Nov. A.D. 1905.

WILLIAM L WATERS.

wirnvsses \ELLX QL'IGLEY, Jous 1-]. 821..

